Steel Pipe Flanges
Complete line of pressure-rated flanges for every piping application. From blind flanges to orifice flanges, we deliver ASME-certified solutions for demanding industrial environments.
Request Flange SpecificationsComplete Flange Type Range
Each flange type rated for specific applications and pressure requirements. We produce all standard types and custom configurations.
Blind Flanges
Solid one-piece flanges without a bore hole, used to blank off the end of piping systems. Ideal for terminal points, isolation, and dead-leg applications requiring complete closure.
Common Applications:
- •Pressure vessel connections
- •Pump and equipment discharge points
- •Isolation flanges
- •Terminal piping applications
Weld Neck Flanges
Most popular flange type featuring a long radius neck that reinforces the connection. The tapered design distributes stress more effectively than other types, making them ideal for high-pressure and high-temperature service.
Common Applications:
- •High-pressure systems
- •Elevated temperature service
- •Critical piping connections
- •ASME pressure vessel flanges
Slip-On Flanges
Flanges that slide over the pipe end and are welded both inside and outside. Lower cost than weld neck but less robust in high-stress applications. Easier to align during installation.
Common Applications:
- •Standard industrial piping
- •Low to medium pressure systems
- •General utility applications
- •Cost-sensitive projects
Threaded Flanges
Flanges with internal threads allowing connection to threaded pipe without welding. Ideal for modular installations, maintenance accessibility, and applications where welding is impractical.
Common Applications:
- •Low-pressure applications
- •Maintenance-friendly connections
- •Modular piping systems
- •Instrumentation lines
Socket Weld Flanges
Compact flanges where the pipe fits into a socket and is fillet welded. Suitable for small diameter, high-pressure applications. Reduces overall connection length compared to slip-on designs.
Common Applications:
- •High-pressure small-bore systems
- •Instrumentation connections
- •Space-constrained applications
- •Compact manifold designs
Lap Joint Flanges
Specialty flanges that work with a stub end, allowing easy removal without disturbing the pipe run. Used primarily in systems requiring frequent disconnection for maintenance or modifications.
Common Applications:
- •Frequent maintenance access
- •Changeover applications
- •Experimental or temporary systems
- •Specialized processing plants
Orifice Flanges
Specifically designed flanges with tapped holes for orifice plate installation and pressure taps. Engineered for accurate flow measurement in custody transfer and process control applications.
Common Applications:
- •Flow measurement systems
- •Custody transfer applications
- •Process control monitoring
- •Differential pressure measurement
Spectacle Blind Flanges
Innovative design combining a blind section with a ring section in a single component. Allows quick switching between full isolation and open flow without breaking the connection.
Common Applications:
- •Isolation and bypass operations
- •Maintenance and inspection shutdowns
- •Process line switching
- •Variable flow requirements
Long Weld Neck Flanges
Extended bore weld neck flanges for applications requiring longer hub engagement with the pipe. Provides additional reinforcement for extreme pressure or temperature conditions.
Common Applications:
- •Ultra-high pressure systems
- •Cryogenic service
- •Extreme temperature applications
- •Critical hydrocarbon processing
Plate Flanges
Large diameter flanges produced from flat plate stock rather than forging. Economical for large diameters and custom geometries. Custom drilling and bolt hole spacing available.
Common Applications:
- •Large diameter piping (36" to 144"+)
- •Water and wastewater systems
- •Low-pressure vessel connections
- •Custom large-bore applications
Pressure Class Specifications
Flanges available in all standard ASME B16.5 pressure classes: 150, 300, 400, 600, 900, 1500, and 2500. Pressure-temperature ratings depend on both class and material group per ASME B16.5 Table 2.
| Pressure Class | Typical Applications |
|---|---|
| Class 150 | Low-pressure systems, utility service |
| Class 300 | Industrial piping, general process systems |
| Class 400 | Intermediate pressure applications |
| Class 600 | High-pressure applications, elevated temperature |
| Class 900 | Very high pressure, extreme temperature |
| Class 1500 | Ultra-high pressure, critical applications |
| Class 2500 | Maximum pressure systems, specialized applications |
For material-specific pressure-temperature ratings, refer to ASME B16.5 Table 2 (Group 1.1 for A105 carbon steel; Group 2.2/2.3 for F304/F316 stainless; Group 1.9/1.10 for chrome-moly alloys). Call (281) 484-8325 for project-specific verification.
Size Range & Standards
Available Sizes
We supply flanges across the complete industry size range from small bore instrumentation connections through ultra-large diameter applications.
- Small Diameter:1/2" to 4"
- Standard Range:6" to 24"
- Large Diameter:30" to 60"+
ASME Standards
- ASME B16.5
Pipe flanges up to 24" NPS
- ASME B16.47
Large diameter flanges 26" to 60"+
- MSS SP-44
Stainless steel pipe flanges
Custom Capabilities
- ✓ Custom bolt hole patterns
- ✓ Non-standard bores
- ✓ Overbore flanges
- ✓ Special facings (RTJ, flat)
- ✓ Weld overlay applications
- ✓ Exotic material options
Material Selection
Choose the right material for your pressure and temperature requirements.
Comprehensive Standards Support
All flanges sourced with full traceability, material certs, and dimensional verification per applicable standards.
Ready to Order Your Flanges?
Provide your specifications-type, size, pressure class, material, and quantity-and our team will deliver accurate quotes and rapid delivery.
Request Flange Quote